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Ext_authz can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata

High
phlax published GHSA-gq3v-vvhj-96j6 Feb 9, 2024

Package

Envoy Proxy (Envoy)

Affected versions

<1.29.1

Patched versions

1.29.1, 1.28.1, 1.27.3, 1.26.7

Description

Summary

External authentication can be bypassed by downstream connections that use PROXY protocol.

Details

Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true.

Impact

Authentication bypass

Credit

allenh@palantir.com

Severity

High
8.6
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVE ID

CVE-2024-23324

Weaknesses

Credits